[windows] fix memory leak in ListView

src/Controls/src/Core/Compatibility/Handlers/ListView/Windows/CellControl.cs

@@ -69,6 +69,8 @@ void OnUnloaded(object sender, RoutedEventArgs e)
 			Cell.SendDisappearing();
 			// 🚀 unsubscribe from propertychanged
 			Cell.PropertyChanged -= _propertyChangedHandler;
+			// Allows the Cell to unsubscribe from Parent.PropertyChanged
+			Cell.Parent = null;
 		}
 
 

src/Controls/tests/DeviceTests/Elements/ListView/ListViewTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Linq;
@@ -272,5 +273,82 @@ public async Task NullTemplateDoesntCrash()
 				ValidatePlatformCells(listView);
 			});
 		}
+
+		[Fact("Cells Do Not Leak"
+#if !WINDOWS
+			, Skip = "Skip for now on other platforms, due to how cells are recycled this does not pass."
+#endif
+		)]
+		public async Task CellsDoNotLeak()
+		{
+			SetupBuilder();
+
+			var references = new List<WeakReference>();
+			var listView = new ListView
+			{
+				ItemTemplate = new DataTemplate(() =>
+				{
+					var cell = new TextCell();
+					references.Add(new(cell));
+					return cell;
+				})
+			};
+
+			await CreateHandlerAndAddToWindow<ListViewRenderer>(listView, async _ =>
+			{
+				listView.ItemsSource = new[] { 1, 2, 3 };
+				await Task.Delay(100);
+				ValidatePlatformCells(listView);
+				listView.ItemsSource = null;
+				await Task.Delay(100);
+				ValidatePlatformCells(listView);
+			});
+
+			await AssertionExtensions.WaitForGC(references.ToArray());
+			foreach (var reference in references)
+			{
+				Assert.False(reference.IsAlive, "Cell should not be alive!");
+			}
+		}
+
+		[Fact("Cells Repopulate After Null ItemsSource")]
+		public async Task CellsRepopulateAfterNullItemsSource()
+		{
+			SetupBuilder();
+
+			List<TextCell> cells = null;
+
+			var listView = new ListView
+			{
+				ItemTemplate = new DataTemplate(() =>
+				{
+					var cell = new TextCell();
+					cell.SetBinding(TextCell.TextProperty, new Binding("."));
+					cells?.Add(cell);
+					return cell;
+				})
+			};
+
+			await CreateHandlerAndAddToWindow<ListViewRenderer>(listView, async _ =>
+			{
+				listView.ItemsSource = new[] { 1, 2, 3 };
+				await Task.Delay(100);
+				ValidatePlatformCells(listView);
+				listView.ItemsSource = null;
+				await Task.Delay(100);
+				ValidatePlatformCells(listView);
+
+				// Now track the new cells
+				cells = new();
+				listView.ItemsSource = new[] { 4, 5, 6 };
+				await Task.Delay(100);
+				ValidatePlatformCells(listView);
+
+				Assert.Equal(3, cells.Count);
+				Assert.Equal("4", cells[0].Text);
+				Assert.Equal("5", cells[1].Text);
+				Assert.Equal("6", cells[2].Text);
+			});
+		}
 	}
 }

src/Controls/tests/DeviceTests/Memory/MemoryTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Threading.Tasks;
 using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Handlers.Compatibility;
 using Microsoft.Maui.Handlers;
 using Microsoft.Maui.Hosting;
 using Xunit;
@@ -22,6 +23,7 @@ void SetupBuilder()
 				handlers.AddHandler<Editor, EditorHandler>();
 				handlers.AddHandler<GraphicsView, GraphicsViewHandler>();
 				handlers.AddHandler<Label, LabelHandler>();
+				handlers.AddHandler<ListView, ListViewRenderer>();
 				handlers.AddHandler<Picker, PickerHandler>();
 				handlers.AddHandler<IContentView, ContentViewHandler>();
 				handlers.AddHandler<Image, ImageHandler>();